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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de251af01e11747c45343b63832dd5d2278273687921e68253aebd75d54f1f7c' 
  AND token = 'HeCBIrRcimnsmh/setElXweFxR7wGan+SvewT0WmVFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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