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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98885d94628f618c3c3d4fd78d3cf19f64503838806f27e45c11620cc410f66b' 
  AND token = 'TkHnlQJLJsnJyu/nDsKUQDGUjhS2dIQxwHW11LnnMk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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