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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dc03d825e9f8142f3d2d0db34e159ce0dd1e2cd739e20edc78bef6f915350d6' 
  AND token = '7hvcTs3xjSdTL2GNrUbZiFTqKzthvhi6qEc6aW1RMJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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