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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae9433c7178080bc5b475e2b88a11841e480619d991580cfb9dc1cfdd4cb89c' 
  AND token = 'RaUDvVB//GMjF9eOIUIugRtquZzz06sEapb/+cmM7dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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