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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd3e6c2fa7cbdb24b0dd9e6dfdecaebf424a8f43d7430f2827d64bea3aee182' 
  AND token = 'lM1jIPbvSbp4/FhQb0zH20G17VR1OSnv8u30mLxAocA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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