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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1383d94d731908a67404590a8f06be9aed296b223446a33ca33a74fa7c09adb3' 
  AND token = 'NFF/qPPAnpV3cgmDr9vzCgKki7Q4O0qZ7u/qq/uUVX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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