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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a904a61908a52f24c4f86bb71c4be3be536f8aef604f1d860f6d1833c1b7e6' 
  AND token = '4wPeRMh6LWmQSHHT9rqBR86k1sYv+qkPGEJM8BPDOxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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