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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c0f4ad22560128aabed76b614f3c37b2e1cd8296b872aabe3fc1b0719e5295' 
  AND token = '0WSQE/v6O2t1MBwxatxqge/NFipwUXztHC8Vde1c8nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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