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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26006507c9d736046c44401d79794a897b34f609bc2aa911e89dfbd682d092f1' 
  AND token = '+qPJzgC0Yg4Phxs17Rtem3FvZ/IF5f9ykt4OveMN+n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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