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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff27cbec0a2ce11bcb4d1b3e0d65b2e743ae49912fff59e93d80e6142bc9ffb2' 
  AND token = 'mLg0gaNdR5eOitqU21l16Iik9WNYdVH9LcZ/y40+E+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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