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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088b29f5e08aa5d999ed11b11215842df74a092003437cbb7d5799662fc90071' 
  AND token = '6QVR8511JTa1r9cPGf00x515uIGzHFH2kalkNsX0xnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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