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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b11873276e02abb84612abddd7d672c2dcc3b11e82bc4647586b0f49dbb3a2' 
  AND token = 'c9WKZM+KABy1F/traZuOb3xAxDIOObJjceCmOJrxsxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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