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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bc6544843dd31a3a8f841b0f531334701aa66f56b9e7596925054160d36c46a' 
  AND token = '9rtF3oU+SyKsV1Lez9DqUbYGDLLOR//3jpq4wi6BbsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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