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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b738aec1b9c69b10501757873d0568b38ca6df6a767748e50c5a876c4fc32f3d' 
  AND token = 'dq3AH7LzLmieZDdyWnpDiH2wIB39fNkCMZWCcAldQko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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