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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a1da2a89ac44e00175956e5eda1c14a6be35ac67aef8a763abc9d6eabd9b090' 
  AND token = '3E2SjKuLoFZ41IedrmjEnqaUpBe8mk2S8W2dtuROsEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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