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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf0a62f511e30ff8de5a0948c68783a9815205741057ea0cf92a7983824d727' 
  AND token = '7t6/cDE9ToUv7ppTZ9RdTBWqG7fi/nC3aJtB7aWBtfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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