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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e276fa903c0e193eceabaca17378dd5790d557d88443f4a87df335e5a81095a8' 
  AND token = '+IufPLJ9tf+Vajt+K8fVylR5nXOfts2yt2p82MO8qiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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