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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4a0e6a444c13c24756839d6396d27f54a14349960624a805fe839b72985beea' 
  AND token = 'IxxMxfpRrL/iC62b260gSts4U6j0Dx9+WMx8sKUsPic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}