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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2629d7a1c33b6bd86461a72261fd5a2cc53dc3d7b3dfb3c805cb831a1e294fbc' 
  AND token = 'KeODpbWryimui/3HsuVIsxGkdzs+WT+XrDWK86DyJus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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