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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3e90d702fb29fc8c8dc0dcbb873cabe7dffde686a658be5e6c312bdff946fc8' 
  AND token = 'xRg60Bw1kfiFBLX4Gr1C7B5jw5p6+7ZiDOHCALb/DSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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