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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c161240d1a779fb91ef9f390930128ed29355bfb7863a66b5ff7e21757773e' 
  AND token = 'ZQ18xKUzdBtqpQ7PPPYwVMxyjNt24Hsw2j12eKe6rvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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