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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca507981dfbb93e08391a632c78a531c30ae9f95ab7adceb55a3c87440076128' 
  AND token = 'hNhT3oaLTpmGA4XsK0YIe+WOrtFyzww57gRC6PgGBjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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