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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac0c8a40da894761b8e3eda92fe21d83ced8553e7784502111e901df2f37cde' 
  AND token = 'PtOG2pb0MhvlLClHOtncwiZ89GeqVcv0qdZpkvYHH+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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