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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b3b61efceeebb9f5eae9acff94eab1f0daef644d7f61d8e0e1439ac5e30923' 
  AND token = 'S66f5mP6e98762U1pTHL3uLV6PzX2wOtrYtcH0YidIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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