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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '152c9cfd49624e59ca010e639d562ff61281c58ce84c3f4ad69426d8c3f40e09' 
  AND token = 'qCw/syuJIqcMH8VNFG8ffO+4p9dYuejFgakXudV5/KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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