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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c4b6e08a2e7cde04cae4f12cdc2b6b03858e8663f7d60aa4208ab8b39ef96d4' 
  AND token = 'TWAPIm3dB32kAB+X4a2im1Ve4c8GXtm7oT9b0u/Gn98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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