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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de8322c627d33476351b5d6d6f9a63d98b81598f58ed39953a1860a4667e5a8' 
  AND token = 'LDyyoPI4c5UGTA2x1ZNEuPWEufaPhIWg2poN/E4ojkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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