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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7374cd4ecb4a0291138a80ad4f6cbf5a4c41ef3f1ae4eecb0b0ba79884075956' 
  AND token = 'iOt13AMVLlEmGkFJKGxurlf4Feb2aQNb1XpbH25K+zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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