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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd41a016ef635a7fa713fff30b5a726202dd76eea1ac9d8b88dcf0a2a9d696a' 
  AND token = 'RbQOWRdi4NXmgqhijl3V2+6P59RfVcQ61fQk4HdutYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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