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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324a652d4b4689f3aaa4d36fc884a2f55805a88962bb5910e3aae421d630af42' 
  AND token = 'WArkWflUKPECq0AHawDjIdvvYUtU2uQAGL0w8OB6xSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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