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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f3e24ab99fd899ffb935391d5cba1350ca169cff1824ad714a5668ab1dd1b6' 
  AND token = 'cKTT+uBmNo8ya5Moxq5rmPgpku55PT7uEQ3tayEFhrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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