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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2a9ddc1e3bf46ab9f7d91f9016a5cc0d4f97afac6a61d311308a41d92ea9bbc' 
  AND token = 'OvqlA4drmJIFV3rLdULsUv9A+KT2fm4Ulwjy5NXhtk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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