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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c10ef7c16a8132828c700a8684cff3ca9d8d421ca78563b27ac9b750b8a9619' 
  AND token = 'TdRHLRgy7lL2cDR0eNH6458Y2jRD+7/HW8PajNYgEN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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