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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f60cb3865a5dd7578176b6fbb596ddea5bd623e355f81638ffe84610961c0aa' 
  AND token = 'NA5bKBpnMbw6UQv66KDM4bEzodXpsm52aB7ZSS8aX2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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