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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7bdf2b2ed5d7b1705713eaaeb906ef36fcbee9e9d37316aca07c819c24b87df' 
  AND token = 'jrv1k7dEYgzVbI4FloAbtFEC0DA+p65kbBtCaDQoQ4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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