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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6cd0ceb12536da90a948af8e532539b56f9159fdd676f190fed1970705be25' 
  AND token = 'F63bHkK3YNJ5rLIxaqgdG0TOirDxN/BAAHk1yfT7W0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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