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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8774acba6c09fa849257bbcc64e98401c21246e1b34d3121c1f31e9440dca2ac' 
  AND token = 'lnEUgH2VMecWUb9QigezV/AYVLsUAVbxBCt1B+VaD38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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