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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30664f00483ea83535d759484b6ae04de9fd96b0bec1e3b3b7a376679a77dfa' 
  AND token = '4z10Ke9CpXns1JaOhshZnQcErvH43wXOqmu3c1bwv/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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