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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de2b07d0109b2aadfc3bb3c12d3f65c4434dbe0f32329c7196260ec4d7bb93a9' 
  AND token = 'hQi3KAdfaNyo21h5Zk7vlN0Y0lccRk0Fit/KWn8xXEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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