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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0a34fe5435f66b1f1cfdf86c01a6fd42a67f4b9527c50434d54d1f7d8ca985' 
  AND token = 'KVbC/N7ZZfVjl8ahOJF3Jav0XQAj4R6KxRpSeu6DILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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