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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31635fdfe40e9dfd445b4633295adbf4b440a33fde8b96d4f49b0282bafb0bf' 
  AND token = 'PwKvnE0Ss842PtAFUjTQ/WdG3x1F+U5ilqXD5LHz31A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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