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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e6d2ff5c665834f827bbe427a0c4f978c66340d3e7894fc8f64ecb3db9a101' 
  AND token = '9TmX13c5VHHZf/i9izZU2wQmebovkxIbsZ0315WY3tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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