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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee34c7f33ec5996f0dcef7b4431d314fd9f90a9ff523e4ad6e6b21ffe6f13d8' 
  AND token = 'gzDDpSCzJ0CjpZ0zpctqrRSZVO/tW6JtL7q6nd8dNS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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