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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5db6f333fd288784073e4d50ed48535876c5f373576fc5f9b0c23752646c56' 
  AND token = 'tU+cw0G7t601/LLrZaaGlvcEErl4gaT94L06PLCnZMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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