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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32893bfbdba7f2ca46708dbead12fd8f981d2dca5c595501c376f13de7a66456' 
  AND token = '/T3L26SNrWqNdJUJs+Qxm3VtNPb/kQ0oOcCy4RoM3NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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