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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17533d40136c7805e81aa3aa498a3c61d6321f3ef1ed3233ab750e77f1ebecc3' 
  AND token = 'tOc4nYxik0jE/bsM/ppuni5s6qj5K0QTpr9rOUFvbhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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