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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61b592003babbd1132735593e5a5f16ce4451fa886bd6e3a055b6ee4128beb11' 
  AND token = '90fT0K9vNsE9YgMWE17+8ISeOHeDvLByz7QsTktG+s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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