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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2d49667951acd34a3fa115d6f9fa3fe1ac3b1b806ebca062dc4009a5a06cef' 
  AND token = 'nqaNNI8gq5qhor/Flocn/+hDFwvrJtKfelq+qo11MYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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