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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089958e2ffe3de3e5dda4878884ed8f19ce6127edc633556bbe58a1080a52924' 
  AND token = 'QHDcrQcoNjeFHQExahaI+t1Av7iLKRqm/JWnYl4LGIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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