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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ddd12152f9b9c95a2e15930863c1f99a894db9752dc7700f0df75a7bef1288a' 
  AND token = 'KDLSyI3ykHeFNq2egKYcYaIZA6elqiknHgDzn4Y9f2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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