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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4aa6bb3a5bb6351957c77f892b8198d4d26c1f48c72b22fdbc88247150d0bd6' 
  AND token = 'WMljqr0VGiTxgxHEd5a79B7IgDoOMAQ1t5RguvXYl4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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