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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1d9b336616345c8c041b564a3a6fac92181b474ed952a636c28c1f1ad6b3e8' 
  AND token = '9Nx2t2tbkpeGwMmMg8s3viUT2UzEiWbCodNs+vQuMqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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